sweetie, her using has nothing to do with how she was raised. Her sister HATES drugs, right? They were raised together? You said, yourself, she said she just started it to do "something different"...me, too. Unfortunately, we became addicts.
Although I have no kids, I am trying to figure out how to keep my niece from becoming an addict (she's my stepsister's daughter, so not blood related, but every relative on both her mom and dad's sides have had problems with addiction). What has helped is her seeing me struggle so hard to get my life back. Kids think they're invincible, nothing bad will happen to THEM!
I think she isn't done yet and hasn't hit bottom. I also believe what was said above...once we get used to NOT feeling anything, it's really hard to learn how to deal with life clean again. Hard, but not impossible.
She's young, and she thinks she can "handle it". Unfortunately, her time in jail was not enough to make her hit bottom. I'm sorry.
Hugs and prayers!
Amy